setgid man page on Manjaro

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SETGID(2)		   Linux Programmer's Manual		     SETGID(2)

       setgid - set group identity

       #include <sys/types.h>
       #include <unistd.h>

       int setgid(gid_t gid);

       setgid()	 sets  the  effective group ID of the calling process.	If the
       caller is the superuser, the real GID and saved set-group-ID  are  also

       Under  Linux,  setgid()	is implemented like the POSIX version with the
       _POSIX_SAVED_IDS feature.  This allows a set-group-ID program  that  is
       not  set-user-ID-root  to drop all of its group privileges, do some un-
       privileged work, and then reengage the original effective group ID in a
       secure manner.

       On  success,  zero is returned.	On error, -1 is returned, and errno is
       set appropriately.

       EPERM  The calling  process  is	not  privileged	 (does	not  have  the
	      CAP_SETGID capability), and gid does not match the real group ID
	      or saved set-group-ID of the calling process.

       SVr4, POSIX.1-2001.

       The original Linux setgid() system call	supported  only	 16-bit	 group
       IDs.   Subsequently,  Linux 2.4 added setgid32() supporting 32-bit IDs.
       The glibc setgid() wrapper function transparently deals with the varia‐
       tion across kernel versions.

       getgid(2), setegid(2), setregid(2), capabilities(7), credentials(7)

       This  page  is  part of release 3.65 of the Linux man-pages project.  A
       description of the project, and information about reporting  bugs,  can
       be found at

Linux				  2010-11-22			     SETGID(2)

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